Hysteresis Compensation in Piezo-Actuator

Hysteresis Compensation in Piezo-Actuator

Sinha, R.K.

Hossein Nia Kani, S.H. (mentor)

Mechanical, Maritime and Materials Engineering

Precision and Microsystems Engineering (PME)

2016-08-31

To meet the ever increasing demands for the linearization of the nonlinear plant various techniques have been proposed. Out of the possible approaches disturbance observer based techniques is very popular in industrial application due to its simple implementation and high accuracy. However, the linear disturbance observer based technique is limited upto a certain frequency which in-turn is defined by the fundamental limitation of the linear control techniques. In this work a novel generalization of second order reset element is proposed with application in improving the performance of the disturbance observer (DOB) based compensation scheme. To this end, two new configurations are proposed for the improvement of the linear DOB. In the first configuration a new nonlinear low-passing filter has been proposed with similar gain as a linear filter but with much less phase lag which results in improved performance of the linear DOB. In the second configuration a new implementation of the combination of the linear DOB with the reset elements is proposed which results in minimization of sensitivity of the complete closed loop. Eventually, the effectiveness of the proposed architectures is proven on a practical setup of a PiezoActuator, which is well known to have a dominant hysteretic nonlinearity in voltage to displacement relation. The disturbance observer based compensation scheme has wide domain of applications extending from input/output disturbance rejection, eliminating unmodelled dynamics to the compensation of bounded nonlinearities. So, with the proposed improvement to the linear DOB the performance of a number of application where DOBs are currently being used, can be improved and at the same time new application areas for DOB also opens up.

http://resolver.tudelft.nl/uuid:31f783bc-ca78-4fb2-bf45-18452dd8139d

2017-08-31

Student theses

master thesis

(c) 2016 Sinha, R.K.